package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.xmlbeans.impl.xb.xsdschema.Attribute;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    // 微信服务接口地址
    public static final String WECHAT_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Resource
    private WeChatProperties properties;
    @Resource
    private UserMapper userMapper;

    // 微信登录
    public User WechatLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());

        // 判断 openid 是否为空则表示登录失败，抛出异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);

        // 如果是新用户，自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        // 返回这个用户对象
        return user;
    }

    // 调用微信接口服务，获取当前微信用户的 openid
    private String getOpenid(String code) {
        // 调用微信接口服务，获得当前微信用户的 openid
        Map<String, String> map = new HashMap<String, String>();
        map.put("appid", properties.getAppid());
        map.put("secret", properties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");

        String json = HttpClientUtil.doGet(WECHAT_LOGIN, map);
        JSONObject jsonObject = JSONObject.parseObject(json);

        return jsonObject.getString("openid");
    }
}
